A Downing Street spokesperson said:
This afternoon the Prime Minister spoke to President Trump to express her condolences regarding yesterday’s terror attack in New York. The Prime Minister said she was deeply shocked and saddened by the loss of life and that her thoughts and prayers remain with all those affected. She reiterated that the UK will continue to stand shoulder to shoulder with the United States in defeating the evil of terrorism. The two leaders noted the very strong intelligence and security co-operation between our two countries.
The Prime Minister and President Trump also discussed the need for an international approach to tackling poisonous terrorist ideology online.